mutations Flashcards
1
Q
What is a gene mutation?
A
A change in the order of the A, G, C, T bases that make up particular genes
2
Q
What are the 3 main reasons why mutations occur?
A
one of the bases may be:
- left out
- added
- substituted
3
Q
What is a good example of a current mammal gene mutation?
A
Spirit bear’s white fur
4
Q
Genes are read___bases at a time, each set producing a part of a protein
A
3
5
Q
ex. of a positive mutation
A
people being resistant to HIV disease because of a mutated gene
6
Q
give 2 examples of a negative mutation
A
- sickle cell anemia
- cystic fibrosis
7
Q
What are mutagens?
A
substances or factors that can cause mutations in DNA
8
Q
give 5 examples of mutagens
A
- viruses
- cigarette smoke
- radiation from x rays
- exposure to UV rays
- pollutants (ex. mercury metal)
